Pattern-drawing apparatus.



H. P. MACDONALD. PATTERN DRAWING APPARATUS.

APPLICATION FILED FEB. s, 1912.

1,065,541. Patented June 24,1913.

2 SHEETSSHEET 1.

WITNESSES:

Sm f INVENTOR.

Blj I'M WW $6M COLUMBIA PLANOURAPH COQWASIHNGTON, D. c.

H. P. MACDONALD. PATTERN DRAWING APPARATUS.

APPLIQATION IILED FEB. s, 1912.

1,065,541, Patented June 24, 1913. Q 2 SHEET$SHEET Z.

5/ 5c H" .28 g 3.9 X- as H 7 av l] Ef Fa WITNESSES W KM BY HARRY P.MACDONALD, F MONTGLAIR, NEl/V JERSEY, ASSIGNOR Tb THE SNEAD AND CO. IRONWORKS, OF JERSEY CITY, NEl/V JERSEY, A CORPORATION OF NEW JERSEY;

PATTERN-DRAVIING APPARATUS.

. Application filed February 6, 1912.

To all whomit may 007106771.

Be it known that I, HARRY P. MACDONALD, a citizen of the United States,residing at Montclair, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements in Pattern-Brav ingrrpparatus, of which the following is a specification.

The invention has reference to pattern drawin apparatus particularly ofthe type wnerein the pattern is drawn by lowering the pattern support.It has for its primary objects, the provision in apparatus of thecharacter described of an improved arrangement of operating mechanismfor raising and lowering the pattern support; the provision of improvedguard devices to prevent sand, grit and dirt from working into theoperating mechanism; and the provision in a machine for dra ing largepatterns of an improved operating mechanism wherein the actuating partsmove in unison, preventing tilting of the pattern support and patternduring the drawing operation, thereby reducing to a minimum, liabilityof injury to the mold. My invention also contemplates the provision ofimproved guide and counterbalance means. These, together with such otherobjects as may hereinafter appear, I attain by means of a constructionillustrated in preferred form in the accompanying drawings, wherein-Figure 1 is a plan View of my improved apparatus, parts of the machinebeing removed to more clearly disclose the operating mechanism; Figure 2is an irregular, longi tudinal section on the line 11-11 of Figure 1;Fig. 3 is a transverse section on the line Ill-ill of Figure 2, andFigs. 4, 5 and 6 are views of details of my invention.

My invention is designed primarily for use on large molding machineswherein the patterns are of considerable size, designed for example fora large rectangular flat casting.

In carrying out my invention, I provide a main frame 7 which is box-likein shape and is provided with upwardly extending flanges or side railsS8 which are adapted to serve as a flask support. Slidably mounted inthe frame is a pattern support or table 9 of approximately rectangularshape fitting the frame and provided with a plurality of longitudinaland transverse Specification of Letters Patent.

Patented June 24, 1913.

Serial No. 675,826.

strengthening ribs 10. The pat-tern table 1s raised and lowered by meansof toggles 11 which are four in number and are positioned substantiallyat the corners of the pattern table in the manner indicated in Figure 1.The toggles are operated from a main driving shaft 13 mounted in theframe 7 and operated by means of the hand wheel 14. The shaft isprovided with a gear 1% engaging the bevel gear 15 on the vertical shaft16 which is likewise mounted in the frame and is screw threaded. Mount--ed on either side of the shaft 13 are two rock shafts 17 and 18, each ofwhich is provided with an upstanding arm 19 connected to the links 20and 21 which are rotatably mounted on a block 22 which is mounted on thevertical shaft 16. The rock shafts l7 and 18 are each provided with twoarms 23 and 24 which are keyed to prevent relative rotation and areconnected to the toggles 11 by means of connecting rods 25. The patterntable is shown in Fig. 2 in its lowest position and in raising it thehand wheel 14: is rotated to turn the vertical shaft 16 in suchdirection that the block 22 travels downward, which movement causes thelinks 20 and 21 to rotate the rock shafts 1S and 17 in the direction ofthe arrows, and moves the connecting rods 25 outward, causing thetoggles to straighten out and thus elevate the table. The parts are soarranged that when the toggles 11 are straightened out they travelslightly past the vertical until the abutments 26 strike against thelugs or shoulders 2'7 of the frame, thus locking the toggles againstdownward movement until they are released by turning the handle wheel 14in the opposite direction. It will be noted by this construction thatall of the toggles are operated simultaneously by a single actuatingmechanism which results in an even and uniform movement of the patterntable and reduces the liability of injury to the molds to a minimum. Itwill also be noted that the use of toggles to raise and lower the tableis particularly advantageous because the initial downward movement ofthe table when a pattern is being drawn is very slow and graduallyincreases.

In I have illustrated an improved arrangement for adjustably supportingthe table on the toggles which comprises a clevis 28 rotatably securedto the upper arm of the toggles 1 The clevis is provided with ascrew-threaded member 29 somewhat in the nature of a*stud or spindle,which projects through a recess 30 cut into the table and provided witha collar portion 81 upon which the pattern table rests, the table beingclamped in position by means of the nut 32. After the nut 32 has beentightened it locked against rotation, by means of the small plate orkeeper 33 which is inserted into any one of the registering slots 3% andet which are respectively cut into the nut and the spindle. The collar31 is provided with a plurality of notches 2-35 which are engaged by thescrew 36 carried by the arm 37 which is fastened to the clevis by meansof screws 38. will be noted that by this construction the elevation ofthe table with. respect to the flask plates 8 maybe *aried to suitdifferent thicknesses of pattern plates a id to compensate to anywarping or irregularity. The spindle is provided with four slots 3st andthe nut with slots Set. It will be apparent that this construction willafford a very close a l 'ustment of the nut 32, inasi'nuch as a set ofslots will register at every twelfth of a turn of the nut.

in order to obtain greater ease of ope '2 tion, the table 9, which is ofconsiderable weight is carried by the counter balance springs 39 whichare mounted in the blocks of the frame 7 and are of a strength not quitesuliicient to support the table but which will lighten the load of thetable on the operating mechanism. The table is guided in its movement bymeans oi the posts it) which slide in recesses in the shoulders 41 caston the f nine 7. Such a post is provided at each corner of the table inorder to steady the table as it moves.

teferring now to Fig. 8, it will be seen that I have provided the f nine7 with an inwardly projecting lip 42 which extends around the inside ofthe frame just beneath the pattern table. This lip or plate is bentupwardly so as to form a groove to catch and contain any sand or dirtwhich may work past the pattern table. The ends of the frame areprotected by means of the guard strips or plates 4-3 which are carriedby the table 9 and work in grooves formed by the overlappii'ig plates atsecured to the ends of the frame, which serve to prevent the entrance ofsand or dirt into the frame. The bottom of the f 'ame is closed by theplate This construction practically constitutes the frame and patterntable a cloed chamber protecting all the working parts. On reference toFigure (3 which is a side elevation of one of the plates a it will beseen that l have provided hand-hoies H3 whereby access may be readilyhad t the interior of the frame to adjust the pattern table support. Thehandholes are covered by cover plates 411?.

A further advantage of the locking ar- 'angement of the toggles is thatthe load of the pattern support and flask taken elf the operatingmechanism during the amming of the sand.

Having thus described my invention and illust'ated its use, what I claimas new and desire to secure by Letters Patent is the fol.- lowing:

l. A pattern drawing apparatus comprising a flask support, movablepattern support, a toggle means for raising and lowering the patternsupport, and means for a ctuating the togglemeans comprising a threadedshaft, a block having threaded engagen'ient therewith, a rock armconnected to the toggle means, a link between the rock arm and theblock, and means for rotating the shaft.

2. A pattern d *awing appa 'atus comprising in combination, a tlasksupport, a movable patte n support, toggles for raising and lowering thepattern support, a drive shaft, rocking arms, driving connectionsbetween the shaft and rocking arms, and connections between the saidarms and the toggles.

A pattern drawing apparatus comprising in co ubination, a flasksupptuit, a movable pattern support, toggles for raising and loweringthe iattern support, a threaded shaft, a m vable block having threadedengagement with said shaft, rock arms con nected at one end to thetoggles, links connected to the rock arms and the block, and means forrotating the shaft.

4. A pattern drawing appantus compris ing in combination a main f'tmeprovided with a flask support, a pattern support movably mounted in themain frame, mechanism for raising and lowering the pattern support, anda counterbalance spring independent of the operating mechanism forsupport ing the pattern support in the main frame.

5. A pattern drawing apparatus comprising in combination, a main frame,a movable pattern support mounted therein, toggle members for raisingand lowering the pattern support adapted to abut the frame and lock whenin raised position, and means for actuating the toggle members.

6. A pattern drawing apparatus comprising in combination, a main frame,a movable pattern support mounted therein, toggle members for 'a-isingand lowering the pattern support, abutments adapted to engage and lockthe toggle members when in raised position, and means .fo actuating thetoggle members.

7. A pattern drawing apparatus (jOlllpllS- ing in combination, a mo ablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and an adjustableconnection between the toggle meu'iber and the pattern support comp singa member adjustably mounted. on the toggle member for substantiallyvertical movement with respect thereto, and means for clamping thepattern support in position on the said member releasably.

8. A pattern drawing apparatus comprising in combination, a movablepattern support, actuating means for raising and lowering the patternsupport, a main frame in closing the actuating mechanism in which thepattern support is movably mounted, and a guard plate on the innersurface of the frame located beneath the pattern sup port for catchingsand and dirt.

9. A pattern drawing apparatus comprising in combination, a movablepattern frame, a pair of toggle members at each end of the frame adaptedto form a four-point support and a common operating means for actuatingthe toggle members in unison comprising a threaded drive shaft, a rockshaft disposed on each side of the drive shaft, a pair of links mountedon the threaded drive shaft, connections between the links and rockshafts, a pair of armsmounted on each rock shaft, and connectionsbetween said arms and the toggle members.

10. A pattern drawing apparatus comprising in combination, a movablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and a connec tionbetween the toggle member and pattern support comprising a screw studmounted in the toggle member, and means for clamping. the patternsupport in position on the screw stud.

11. A pattern drawing apparatus comprising in combination, a movablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and a connection betweenthe toggle member and pattern support comprising a screw stud mounted inthe toggle member projecting through the pattern support and providedwith an abutment, and a nut on the stud engaging the pattern supportadapted to clamp the support against the abutment.

12. A pattern drawing apparatus com prising in combination, a movablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and a connection betweenthe toggle member and pattern support comprising a screw stud mounted inthe toggle member projecting through the pattern support and providedwith an abutment, a nut on the stud engaging the pattern support andadapted to clamp the support against the abutment, and means for lockingthe nut.

13. A pattern drawing apparatus comprising in combination, a movablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and a connection betweenthe toggle member and pattern support comprising a screw stud mounted inthe toggle member projecting through the pattern support and providedwith an abutment, a nut on the stud engaging the pattern support andadapted to clamp the support against the abutment, and means for lockingthe screw stud.

14. A pattern drawing apparatus com prising in combination, a movablepattern support, a toggle member for raising and lowering the patternsupport, means for actuating the toggle member, and a connection betweenthe toggle member and pattern support comprising a screw stud mounted inthe toggle member projecting through the pattern support and providedwith an abutment, a nut on the stud engaging the pattern support andadapted to clamp the support against the abutment, means for locking thenut and means for locking the stud.

15. A pattern drawing apparatus comprising in combination, a movablepattern support, actuating mechanism for raising and lowering thepattern support, and an adjustable support for supporting the patternsupport on the actuating mechanism comprising a screw stud provided withan abutment, a nut on the stud engaging the pattern support and adaptedto clamp the pattern support against the abutment, a plurality of slotsin the stud, a plurality of slots in the nut, and a keeper adapted tofit into the slots and lock the nut.

16. A pattern drawing apparatus comprising in combination, a movablepattern support, actuating mechanism for raising and lowering thepattern support, and an adjustable support for supporting the pat ternsupport on the actuating mechanism comprising a screw stud provided withan abutment, a nut on the stud engaging the pattern support and adaptedto clamp the pattern support against the abutment, a plurality of slotsin the stud, a greater number of slots in the nut and a keeper adaptedto fit the slots and lock the nut.

17. A pattern drawing apparatus comprising in combination, a movablepattern support, actuating mechanism for raising and lowering thepattern support, and an adjustable support for supporting the patternsupport on the actuating mechanism comprising a screw stud provided withan abutment, a nut on the stud engaging the pattern support and adaptedto clamp the pattern support against the abutment, a. plurality of slotsin the stud, a greater number of slots in the nut, and a member forlocking the stud.

18. A pattern drawing apparatus comprising in combination, a movablepattern support, actuating mechanism for raising and lowering thepattern support, and an adjustable support for supporting the pat ternsupport on the actuating mechanism eon'iprising a screw stud rotatablymounted on the actuating mechanism and adapted to project through thepattern support, a collar on the stud, a nut on the stud engaging thepattern support and adapted to clamp the support against. the collar, anarm mounted on the actuating mechanism, a plurality of recesses in thecollar, and an abutment on the arm adapted to engage one of the recesseson the collar and lock the stud against rotation.

19. pattern drawing apparatus comprising in coinbiiuition. a movablepattern support, actuating mechanism for raising and lowering thepattern support, and an adjustable support for supporting the patternsupport on the actuating mecnanisin comprising a screw stud rotatablymounted on the actuating mechanism and adapted to project through thepattern support, a coila r on the stud, a nut on the stud engaging thepattern support and adapted to clamp the support against the collar, anarm. mounted on the actuating mechanism, a plurality of reeerses in thecollar, a movable abutment on the arm adapted to engage one of therecesses on the collar and lock the stud against rotation, and means forlook ing the nut.

20, it pattern drawing apparatus co1nprising in combination a frame, apattern supporting table mounted for movement therein, operating meansfor raising and lowering the pattern table, the said table being carriedon said operating means, and coimterbalance means supporting the tableso that at no time is the entire weight off the table supported directlyon the operating means,

21. A pattern drawing apparatus co1nprising in combination, a movablepattern support, mechanism for raising and lowering said patternsupport, and an adjustable connection between the operating mechanismand the support comprising a member carried by the former and providedwith a pair oi. abutments engaging the support on opposite sides, one ofsaid abutments being movable.

22. A pattern drawing apparatus comprising in combination, a movablepattern support, mechanism for raising and lowering said patternsupport, and an adjustable connection between the operating mechanismand the support comprising a member carried by the former and providedwith a pair of abutments engaging the support on opposite sides, saidabutments being morably carri d on said member.

In testimony whereot I have hereunto signed my name in the presence ofthe two subscribed witnesses.

H. P. MACDQNALD.

Witnesses C. C. Gnnnnnnn, J. A. AnNoLo.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). C.

